International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 1 (LEGACY A) RESISTANT SMOOTH CRABGRASS
(Digitaria ischaemum)


Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

United States, New Jersey
INTRODUCTION SMOOTH CRABGRASS
Smooth Crabgrass (Digitaria ischaemum) is a monocot weed in the Poaceae family.  In New Jersey this weed first evolved resistance to Group 1 (Legacy A) herbicides in 1996 and infests Turf.   Group 1 (Legacy A) herbicides are known as Inhibition of Acetyl CoA Carboxylase (Inhibition of Acetyl CoA Carboxylase ).  Research has shown that these particular biotypes are resistant to fenoxaprop-ethyl and they may be cross-resistant to other Group 1 (Legacy A) herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameSmooth Crabgrass
SpeciesDigitaria ischaemum
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Herbicidesfenoxaprop-ethyl
LocationUnited States, New Jersey
Year1996
Situation(s)Turf
Contributors - (Alphabetically)Jeffrey Derr 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jeffrey Derr
Limited area in southern part of New Jersey.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Smooth Crabgrass biotype with this Smooth Crabgrass biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on HRAC Group 1 resistant Smooth Crabgrass have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 1 (Legacy A) resistant Smooth Crabgrass from New Jersey please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JEFFREY DERR
Virginia Tech
Bovey Bldg
50 Stone Road E,
Virginia Beach, 23455, Virginia
United States
Email Jeffrey Derr

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in New Jersey have been instrumental in providing you this information. Particular thanks is given to Jeffrey Derr for providing detailed information.
Herbicide Resistant Smooth Crabgrass Globally
(Digitaria ischaemum)
Herbicide Resistant Smooth Crabgrass Globally
(Digitaria ischaemum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Smooth Crabgrass Globally
(Digitaria ischaemum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 United States (New Jersey) United StatesNew Jersey1996 Turf fenoxaprop-ethyl 45 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
177Digitaria ischaemumSmooth Crabgrass556
2 United States (California) United StatesCalifornia2002 Rice quinclorac 45 Auxin Mimics ( HRAC Group 4 (Legacy O)
177Digitaria ischaemumSmooth Crabgrass5134
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, October 4, 2024 .  Available  www.weedscience.org
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